Hook, in plain words
The hook is the half point on a line: the .5 in 3.5 or 44.5. It exists so a bet cannot push. Bettors talk about it because some hooks cost far more than others.
Take the NFL. A favorite at -3 that wins by exactly 3 is a push; at -3.5 the same game is a loss. The underdog's side flips the other way: +3.5 wins where +3 only pushes. Because so many NFL games end by exactly 3, the hook on 3 changes the result of a lot of bets, and books charge accordingly when you buy or sell it.
Buying the hook means paying a worse price to move the line half a point in your favor, for example -3.5 at -110 to -3 at -125. Whether that is worth it depends on how often the game lands on the number you cross. Across most numbers it is not. Across 3 and 7 in the NFL it can be, which is what the half-point calculator measures from live prices.
The idea, drawn
Worked example · illustration
Buying -3.5 down to -3
- -3.5 at
- −110
- -3 at
- −125
- Break-even at -110
- 52.38%
- Break-even at -125
- 55.56%
- At −110 you need to win 52.38% of decided bets; at −125 you need 55.56%.
- The extra cost buys back every game the favorite wins by exactly 3, which turns from a loss into a push.
- In our NFL archive 15.2% of all games ended by exactly 3, so the hook on 3 decides more bets than any other half point.
Buy the hook only where the number you cross lands often enough to pay for the worse price.
Our NFL results archive: every completed game, regular season and playoffs, Sep 1999 to Oct 26, 2026. Counted Oct 29, 2026.